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u in (-oo:+oo)
-1/4 = (-2/3)*u-(1/5) // - (-2/3)*u-(1/5)
1/5-((-2/3)*u)-1/4 = 0
(2/3)*u-1/4+1/5 = 0
2/3*u-1/20 = 0 // + 1/20
2/3*u = 1/20 // : 2/3
u = 1/20/2/3
u = 3/40
u = 3/40
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